Improvement in making pipe-molds



2 Sheets-Sheet 2.

VW. SMI-TH. MAKING MPE-Moms.'

NM1-81,1368. A v Patented Aug. 22,1876`,

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NAPETEHS, PNOTO-LITHOGRAPHER, WASHINGTON. D C.

NITED STATES PATENT Ortner..

VVILLIAlllI- SMITH, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN' MAKING PIPE-MOLDS.

Specification forming part of Letters Patent No. 181,368, dated August 22, 1876; application filed J ahuary 21, 1876.

To all whom t may concern:

Be it known that I, WILLIAM SMITHof Pittsburg, in the county of Allegheny, and in the State of Pennsylvania, have invented certain new and useful Improvements in Forming Molds for Casting Pipe; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

My invention relates to the manufacture of pipe in sand-molds; and it consists in the construction and general arrangement of an apparatus for forming the mold, whereby time and labor are saved, and a more perfect impression of the pattern is produced therein by the equable packing of the sand, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawings, in which- Figure 1 is a vertical section of my apparatus. Fig. 2 is a side elevation of the carriage and lower portion ofthe flask supported thereon. Fig. 3 is a plan view of the carriage.

A represents a hydraulic ram, the working portion of the cylinder of which must equal in length the mold it is designed to make, and a suflicient length of the piston B to retain it working therein. This piston B will, in a fullsized machin e, be packed on its lower end, and the upper end is provided with a mortise or other suitable device to center and hold the pattern D. E E represent the walls of the pit, in which the whole machine is located, which pit is so deep that the upper end of the flask F will project about two or three feet above the platform T, which is supposed to be level with the floor of the foundry. Gr G are strong upright bolts, lrmly fixed in the base of the ram A, and holding firmly on their upper ends the resisting cross-bar C. This bar is provided at its center with a recess for the reception of the flask, which it is intended to hold during the process of packing the sand. 0 is the lower platform within the pit E, on which the workman stands, who has control ofthe working of the machine. It, aswell as ythe lower parts, is built in and sustained by4 the ram A, and provided with valves, &c. J is a hand-wheel, controlling, by means of the rod I, the waste-valve X in the waste-passagev V. P is a circular guide-ring, fastened, by bolts a, to the carriage M. The inner diameter of this ring P is equal to the exterior diameter of the flanges S on the ask F, and

acts as a retainer and centerer for the tlask` and the false ange R. This false flange has vertical parallel sides, and acts as a guide to the bowlpattern V and its packing-ilange, and by its depth below the point S it allows of a sufficient quantity of sand, so that when the pattern V is forced up to said point the sand will be solidly packed. To the rails N are attached stops Y, which are so'placed that when the carriage reaches them the'ask F and other parts shall be centered directly over the pattern D, and ready for work. Z is the central opening in the carriage, through which the pattern and plunger work.

In practice, the rails N are to lead from the pit E to a larger pit, where the molds are first blackwashed, then dried, and afterward cast.

The operation 'of my invention is as follows: The carriage M being in the large pit, the bowlpattern V is rst placed in position, resting on the top of the carriage M, and within the false flange R. The flask F, properly secured, is then placed, resting by its ilange S on the false ring It, and within the guide-ring P. The carriage, with its load, is then rolled into the forming-pit until it strikes the stops Y, `when the center of the bowl is directly-above the body-pattern D, and the flanges S are under, and secured by, the brace C, which covers three-fourths of their surface. Power is then applied to the pump K, and water entering the ram the plunger B and pattern D are elevated to the point shown in Fig. 1. The pump is then stopped, and sand is thrown in from the top platform T until the conical end of the pattern D is covered, when power is again applied to the pump, and the pattern D rises,

and -by means of its conical wedge-shaped head packs the sand firmly againstthe side of the flask F, the-Workman keeping the cone always covered with sand asit advances. When the cone reaches the top, the bodyof the mold has been completed, but the bowl remains to be compressed. This isdoue by the" ger B and pattern D descend'by theirV own` weight, assisted by the atmospheric pressure,Y untilthe conical point of the pattern D isbe-I lowthe carriage M, `which is noWruninto the large pit,the ask with the formed moldlifted off, thebowl portion `of the pattern `removed and replaced, and a new ask beingarranged1 the process `is repeated s Althoughthe hydraulic methodofY obtain` ing the required movement and pressurefoi'f the pattern D is, in` all probability, the best,l as

herein described, still it is evident that a similar movement couldL be obtainedlby the useA of other mechanical devices, or the employment of steam, gas, or compressed air in a cylinder.

Having thns fully described my invention,

\ what I clainiasfnew, and desire to secure by Letters Patent, is-

, 's l. The conical-pointed pattern D, operated g by ahydraulic'ram orother equivalent' means, substantially in the manner and for the purposes herein set forth. l p

2; The hollovr'boWl-pat'terii iV, with its packing-flange, in combination with the llask F, pattern D, and plunger B, as and for the purposes herein set forth.

4. Thecombinatin ofthebarriageMggiiidefl` ang'land false 4ilang'a1t,for supportingV the bowl'lpatternV and 'ilas'bF-i, substantially as i and' for the 'purposeslhereinlset farm Inv testimony thatlliclaimithe foregoing have hereuntoiset my'handiadiseal'this 24th" day o# December, 1875:`

Witnesses: Q

JoHry-"lSgGEYsER," JOHN i D; MoREnAND.- 

